<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    
    </style>
</head>
 
<body>
    <div id="app">
       <input v-on:input="vever" type="text" v-model="msg">
       <p>{{msg1}}</p>
    </div>
     
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.13/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:'#app',
            data:{
            msg:'你好',
            msg1:''
            },
            methods:{
                vever:function (){
                this.msg1=this.msg.split('').reverse().join('')
                }
            }
            
        
        })
        
    </script>
</body>
</html>